TW201616072A - Solar thermal collector and manufacturing method thereof - Google Patents

Abstract

A solar thermal collector and a manufacturing method thereof including the following steps are provided. First, a first slab and a second slab stacked together are provided, and the first slab and the second slab are welded together along a plurality of rails, such that the first slab and the second slab are connected to each other through the rails to form a plurality of stripe-shaped connecting portions. Then, a high pressure medium is filled between the first slab and the second slab, such that the first slab and the second slab, except for the stripe-shaped connecting portions, are pushed away from each other by pressure provided from the high pressure medium, so as to form a plurality of channels divided by the stripe-shaped connecting portions. A solar selective coating is formed on an outer surface of the first slab.

Description

Solar collector and manufacturing method thereof

The invention relates to a solar collector and a manufacturing method thereof.

In recent years, the application of solar energy as an energy-related industry, such as the application of converting solar energy into electrical energy or thermal energy, is rapidly developing. For example, in the application of converting solar light energy into heat energy, a solar thermal collector absorbs radiant energy from sunlight and converts it into heat energy for application or collection, for example, heating water by heat. The heat is transferred to the heat absorbing medium and stored to collect heat energy by the heat absorbing medium to provide heating for use in subsequent applications.

There are many types of existing solar collectors, and some of them are radiant energy that absorbs sunlight by an absorbing plate. The absorbing plate is formed by coating a solar selective coating on the surface of the plate member, wherein the solar selective coating absorbs the radiant energy of the sunlight, and converts the radiant energy into heat energy and then transfers the radiant energy to the absorbing plate. A heat collecting tube on the other surface, which in turn heats the heat absorbing medium (for example, water or other suitable liquid) flowing into the heat collecting tube. However, as can be seen from the above description, after the solar selective coating converts the radiant energy of sunlight into heat energy, the heat energy must be transmitted to the heat collecting tube through the welding junctions of the absorbing plate and the wall of the heat collecting tube. Heat absorbing medium. In other words, the transfer path of thermal energy from the solar selective coating to the heat absorbing medium is long, and heat energy is easily lost.

In order to solve the above problems, some techniques have been used to weld the two plates after forming the grooves on the two plates to form the heat collecting tubes by the grooves on the plates, and the solar selective coating is applied to one of the plates. On the outer surface of the piece. In this way, the board can be regarded as a heat collecting tube. After the solar selective coating converts the radiant energy of sunlight into heat energy, the heat energy can be transmitted to the heat absorbing medium in the heat collecting tube only through the wall of the heat collecting tube. In this way, the transfer path of thermal energy from the solar selective coating to the heat absorbing medium is shortened, so that the heat collecting efficiency of the solar collector is thus improved. However, the above-mentioned method of welding the two plates after forming the grooves on the two plates requires confrontation problems between the plates. The alignment error between the plates will affect the quality of the solar collector, and it takes more production cost to accurately align the positions of the two plates during the manufacturing process.

The invention provides a solar collector and a manufacturing method thereof, which have high production yield and relatively simple production process.

The manufacturing method of the solar thermal collector of the present invention comprises the steps of: providing a first plate member and a second plate member stacked together, and welding the first plate member and the second plate member along a plurality of tracks, so that the first a plate member and the second plate member are joined to each other on the track to form a plurality of strip-shaped joint portions; and a high-pressure medium is filled between the first plate member and the second plate member so as to be outside the strip-shaped joint portion The first panel and the second panel are relatively far apart by pressure and form a plurality of conduits separated by strip-like engagement portions; forming a solar selective coating on the outer surface of the first panel.

The solar collector of the present invention includes a first plate member, a second plate member, a plurality of tubes, and a solar selective coating. The second plate is overlapped with the first plate, and the first plate and the second plate are joined to each other on a plurality of tracks to form a plurality of strip-shaped joints. The pipe is formed by filling a high-pressure medium between the first plate member and the second plate member, so that the first plate member and the second plate member outside the strip-shaped joint portion are relatively separated by pressure, and The pipe is separated by a strip joint. A solar selective coating is disposed on an outer surface of the first panel.

In an embodiment of the invention, the above method of welding the first panel and the second panel comprises laser welding or ultrasonic welding.

In an embodiment of the invention, the high pressure medium comprises a liquid or a gas.

In an embodiment of the present invention, the method for fabricating the solar collector further includes the steps of: placing the welded first plate and the second plate into a mold before filling the high-pressure medium to After filling the high pressure medium, the first plate and the second plate are formed by a mold.

In an embodiment of the invention, the step of forming the solar selective coating on the outer surface of the first panel is prior to the step of filling the high pressure medium.

In an embodiment of the invention, the step of forming the solar selective coating on the outer surface of the first panel is after the step of filling the high pressure medium.

In an embodiment of the invention, the material of the first plate and the second plate comprises metal or plastic.

In an embodiment of the invention, the first stacked first plate member and the second plate member are respectively provided as flat plates.

In an embodiment of the invention, one of the first stacked first and second panels provided is a semi-formed or formed molded panel.

In an embodiment of the invention, the first plate member provided by the above is a metal plate member, and the second plate member is a plastic plate member.

In an embodiment of the invention, the step of welding the first plate member and the second plate member along the trajectory is applied to the outer surface of the second plate member.

In an embodiment of the invention, the surface flatness of the outer surface of the welded second plate member is smaller than the surface flatness of the outer surface of the first plate member.

Based on the above, the solar collector of the present invention and the manufacturing method thereof firstly fuse the first plate member and the second plate member which are superposed on each other, and then pass the high pressure medium between the first plate member and the second plate member. Form a pipe. Therefore, the first plate and the second plate do not need to be accurately aligned when welding, and the situation that the pipe alignment error occurs after the welded plate member can be reduced. Accordingly, the solar collector of the present invention and the method for fabricating the same have a high production yield and a relatively simple manufacturing process.

The above described features and advantages of the invention will be apparent from the following description.

1 is a top plan view of a solar heat collector according to an embodiment of the present invention. Referring to FIG. 1 , in the present embodiment, the solar collector 100 includes a first panel 110 , a second panel 120 , a plurality of conduits 130 , and a solar selective coating 140 . The first panel 110 is joined to the second panel 120 (overlapped below the first panel 110 in FIG. 1). The duct 130 is formed between the first plate member 110 and the second plate member 120. The solar selective coating 140 is disposed on an outer surface of the first panel 110. As such, when the sunlight illuminates the solar collector 100, the solar selective coating 140 can absorb the radiant energy of the sunlight and convert the radiant energy into heat energy and then transfer it to the pipe 130. At this time, the heat absorbing medium (not shown) flows into the pipe 130 of the solar heat collector 100 and flows out of the solar heat collector 100 after absorbing the heat energy transmitted from the solar selective coating 140 to the pipe 130. Accordingly, the radiant energy of sunlight can be absorbed and converted into thermal energy by the solar selective coating 140 of the solar collector 100, and the thermal energy can be absorbed and collected by the heat absorbing medium flowing into the pipe 130.

2A to 2E are schematic cross-sectional views of the solar thermal collector of Fig. 1 taken along the line I-I' during the manufacturing process. Referring to FIG. 1 and FIG. 2A to FIG. 2E , in the embodiment, the manufacturing method of the solar collector 100 includes the following steps. Hereinafter, the manufacturing flow of the solar heat collector 100 of the present embodiment will be sequentially described with reference to FIG. 2A to FIG. 2E.

First, referring to FIG. 1 and FIG. 2A, in step S110, the first plate member 110 and the second plate member 120 are superposed. In this embodiment, the stacked first plate member 110 and the second plate member 120 provided in step S110 are respectively flat plates. After the first plate member 110 and the second plate member 120 are appropriately sized according to requirements, they can be superposed on each other without too precise alignment.

Referring to FIG. 1 and FIG. 2B, in step S120, the first plate member 110 and the second plate member 120 are welded along the plurality of tracks 150 to engage the first plate member 110 and the second plate member 120 on the track 150. A plurality of strip joints 152 are formed. In this embodiment, after the second plate member 120 is overlapped with the first plate member 110, the first plate member 110 and the second plate member 120 are welded along the plurality of tracks 150 to be joined to each other on the track 150. A strip joint 152 is formed. The trajectory 150 can be viewed as a dividing line of the duct 130 illustrated in FIG. 1, and joined to each other along the trajectory 150 to form a strip-shaped joint 152. 2B illustrates the cross-sectional view of the solar thermal collector 100 of FIG. 1 in step S120, so that the trajectory 150 and the strip-shaped joint portion 152 illustrated in FIG. 2B exhibit only a punctiform region. Actually, the shape of the track 150 and the strip-shaped joint portion 152 is strip-shaped (as shown in FIG. 1). Thus, the strip-shaped joint portion 152 which is formed in a strip shape can also form the subsequently formed duct 130 into a strip shape. The tracks 150 are spaced apart from each other by a predetermined pitch and arranged in parallel such that the strip-shaped joints 152 and the subsequently formed tubes 130 are also arranged in parallel. The width w of the strip-shaped joint portion 152 and the size of the spacing d between the adjacent two-shaped joint portions 152 can be adjusted according to requirements, and the size thereof affects the width of the pipe 130 and the distance between the pipes 130.

Moreover, in the embodiment, the step of welding the first plate member 110 and the second plate member 120 along the trajectory 150 may be applied to the outer surface of the second plate member 120. Thus, the surface flatness of the outer surface of the welded second plate member 120 is smaller than the surface flatness of the outer surface of the first plate member 110, that is, the outer surface of the first plate member 110 is smaller than the outer surface of the second plate member 120. The surface can be kept flat. It can be seen that the first plate member 110 and the second plate member 120 are fixed to each other by welding, and the first plate member 110 and the second plate are selectively welded from the outer surface of one of the plates (for example, the second plate member 120). The member 120 can maintain the flatness of the outer surface of the other panel (e.g., the first panel 110) to facilitate maintaining the flatness of the subsequently formed solar selective coating 140.

Next, referring to FIG. 1 and FIG. 2C, in step S130, the welded first plate member 110 and the second plate member 120 are placed in the mold 102. In the present embodiment, the mold 102 has a plurality of grooves 102a. The welded first plate member 110 and the second plate member 120 are placed into the mold 102, and the first plate member 110 and the second plate member 120 outside the strip-shaped engaging portion 152 correspond to the groove 102a. The groove 102a of the present embodiment is, for example, an arcuate groove, but the present invention does not limit the shape of the groove 102a. The shape of the groove 102a affects the shape of the subsequently formed pipe 130, so it can be adjusted as needed.

Next, referring to FIG. 1 and FIG. 2D, in step S140, a high-pressure medium (not shown) is filled between the first plate member 110 and the second plate member 120 so as to be outside the strip-shaped joint portion 152. A plate member 110 and the second plate member 120 are relatively far apart by pressure and form a plurality of ducts 130 separated by strip-like joint portions 152. Specifically, in the present embodiment, the first plate member 110 and the second plate member 120 are fixed to each other at the strip joint portion 152. The high pressure medium may be a liquid or a gas which is filled between the first plate member 110 and the second plate member 120 by a high pressure so that the first plate member 110 and the second plate member 120 outside the strip-shaped engaging portion 152. The tube 130 is formed by being relatively far away from the pressure exerted by the high pressure medium. In other words, the pipe 130 is pressurized by the first plate member 110 and the second plate member 120 outside the strip-shaped joint portion 152 by filling a high-pressure medium between the first plate member 110 and the second plate member 120. While being relatively far apart, the ducts 130 are separated by strip-like joints 152.

In addition, since the first plate member 110 and the second plate member 120 of the present embodiment are first inserted into the mold 102 before filling the high-pressure medium, and the first plate member 110 and the second plate member other than the strip-shaped joint portion 152 120 corresponds to the groove 102a of the mold 102, so after the high pressure medium is filled, the first plate member 110 and the second plate member 120 outside the strip-shaped joint portion 152 can be formed by the groove 102a on the mold 102, and The shape of the cross section of the duct 130 depends on the shape of the groove 102a.

Finally, referring to FIG. 1 and FIG. 2E, in step S150, a solar selective coating layer 140 is formed on the outer surface of the first plate member 110. Specifically, in the present embodiment, the step of forming the solar selective coating layer 140 on the outer surface of the first plate member 110 is after the step of filling the high pressure medium. Since the welding step of the first plate member 110 and the second plate member 120 of the embodiment is applied to the outer surface of the second plate member 120, the outer surface of the first plate member 110 is relatively flat, which is advantageous for selecting solar energy. The coating 140 is formed on the outer surface of the first panel 110. In other words, the manufacturing method of the present embodiment can reduce the situation in which the solar selective coating layer 140 is affected by the strip-shaped joint portion 152 to cause uneven distribution. So far, the solar collector 100 illustrated in FIG. 1 has been initially completed.

In addition to the above-described production process, the method for fabricating the solar collector proposed by the present invention has other applicable fabrication processes. For example, the step of forming the solar selective coating layer 140 (step S150) may be adjusted forward to the step of inserting the welded first plate member 110 and the second plate member 120 into the mold 102 (step S130) and The foregoing step of filling the high pressure medium (step S140). In other words, since the first plate member 110 and the second plate member 120 of the present embodiment are respectively flat plates before being joined to each other, the solar selective coating layer 140 may be formed before the step S130 on the first plate member 110 that still presents a flat shape. On the outer surface. Further, the solar selective coating layer 140 may also be formed on the first plate member 110 that still assumes a flat shape and has not been welded to the second plate member 120 before the step S120. As such, the solar selective coating 140 can be evenly distributed over the outer surface of the first panel 110. It can be seen that the step of forming the solar selective coating layer 140 (step S150) can be adjusted to the first step of welding the first plate 110 and the second plate 120 (step S120), and then adjusting to the first plate 110 and the second plate. After the step of the sheet 120 (step S120) and the step of filling the high-pressure medium to form the pipe 130 (step S140), or the step of filling the high-pressure medium to form the pipe 130 (step S140), the invention is not limited The order in which the solar selective coating 140 is formed.

On the other hand, please refer to FIG. 1 and FIG. 2A to FIG. 2E. In this embodiment, the material of the first plate member 110 and the second plate member 120 may be metal or plastic, which may be selected according to requirements. For example, the metal material has good heat transfer efficiency, and helps to transfer the heat energy converted by the solar selective coating 140 to the internal heat absorbing medium after forming the pipe 130. In contrast, the plastic material has good plasticity, which helps to improve the forming speed of the pipe 130 during the manufacturing process of the pipe 130 by the high-pressure medium, and the plastic material has the advantages of light weight and low cost. At this time, the method of welding the first plate member 110 and the second plate member 120 may be selected according to the materials of the first plate member 110 and the second plate member 120. When the materials of the first plate member 110 and the second plate member 120 are made of metal, the method of welding the first plate member 110 and the second plate member 120 may be laser welding. Alternatively, when the material of the first plate 110 and the second plate 120 is plastic, the method of welding the first plate 110 and the second plate 120 may be ultrasonic welding. The above materials and welding methods are only for exemplification, and the invention is not limited thereto.

Furthermore, in this embodiment, the materials of the first plate member 110 and the second plate member 120 are not limited to the same. For example, please refer to FIG. 3 , where FIG. 3 is a cross-sectional view of the solar collector of FIG. 2B in another manufacturing process. In the embodiment of FIG. 3, since the solar selective coating layer 140 is disposed on the outer surface of the first plate member 110a in the subsequent step, the heat transfer efficiency of the first plate member 110a is compared to that of the second plate member 120. Heat transfer efficiency is more important. Therefore, in the embodiment of FIG. 3, the material of the first plate member 110a may be metal. However, the plasticity of the metal material is lower than that of the plastic material, so the laminated first plate member 110a provided in step S110 may be a semi-formed or formed molding plate member. In other words, the first panel 110a has been previously formed with a plurality of grooves 112 via suitable processing that will form the conduit 130 in a subsequent step. Thus, since the first plate member 110a is a semi-formed or formed metal plate member, the manufacturing time of the subsequent formation of the pipe 130 by the high-pressure medium is thus reduced, and the subsequently formed solar selective coating layer 140 absorbs sunlight. The heat energy converted by the radiant energy can be quickly transferred to the heat absorbing medium in the duct 130 by the first plate member 110a. In contrast, since the heat transfer efficiency of the second plate member 120 is not influential as the heat transfer efficiency of the first plate member 110a, the second plate member 120 may be selected from a plastic plate member to reduce the solar collector formed subsequently. Weight and reduce production costs. At this time, since the second plate member 120 of the plastic material has good plasticity, the second plate member 120 can be omitted from the additional processing to maintain the flat shape, which can be subsequently formed by the high-pressure medium. Thus, the second plate member 120 made of plastic material can be quickly formed in the process of filling the high-pressure medium to form the pipe 130, and the weight of the solar heat collector can be alleviated. Based on the above embodiments, the materials of the first plate 110 or 110a and the second plate 120 can be independently selected according to requirements. The first plate member 110a and the second plate member 120 can be fixed to each other by ultrasonic welding or other fixing method suitable for fixing the metal member and the plastic member, which can be adjusted according to requirements.

In addition, in the embodiment of FIG. 3, although the first plate member 110a is a semi-formed or formed metal plate, the second plate member 120 made of a plastic material still maintains a flat shape, so that the first one is provided. In the step of the plate member 110a and the second plate member 120 (step S110), the first plate member 110a and the second plate member 120 may be superposed on each other without precise alignment, and the first plate may be welded along the track 150. The step of the member 110a and the second plate member 120 (step S120) is applied to the outer surface of the second plate member 120 such that the outer surface of the first plate member 110a is relatively flat. The welded first plate member 110a and the second plate member 120 can also form the pipe 130 by the step of filling the high-pressure medium, and form the solar selective coating layer 140 on the outer surface of the first plate member 110a. The detailed description of the above steps can be referred to the description of the previous embodiment, and will not be further described herein.

Referring again to FIG. 1, in the present embodiment, in addition to the above-described members, the solar heat collector 100 further includes communication pipes 160a and 160b. The communication pipes 160a and 160b communicate with the pipe 130 such that the heat absorbing medium flows from the outside of the solar heat collector 100 into the pipe 130 in the solar heat collector 100, and flows out of the solar heat collector 100 from the pipe 130 in the solar heat collector 100. In other words, the communication pipes 160a and 160b can be regarded as the heat transfer medium flowing into and out of the entrance and exit of the solar heat collector 100. The connecting tubes 160a and 160b can be formed between the first panel 110 and the second panel 120 in the same manner as the duct 130 described above. In other words, the manufacturing method of the present embodiment can simultaneously form the pipe 130 and the communication pipes 160a and 160b. In addition, although the solar heat collector 100 of FIG. 1 is exemplified by two communication pipes 160a and 160b, the number and position of the communication pipes can be adjusted according to requirements. Based on the above, the solar collector 100 can absorb the radiant energy of sunlight by the solar selective coating 140, and the solar selective coating 140 converts the radiant energy into heat energy and then transfers it to the pipe 130. As such, the solar collector 100 can further absorb thermal energy by the heat absorbing medium flowing into the pipe 130, and the heat absorbing medium flows out of the pipe 130 after absorbing heat energy to further apply or store the collected heat energy.

In summary, the solar collector of the present invention and the manufacturing method thereof first fuse the first plate and the second plate which are overlapped along a plurality of tracks, and then pass the high-voltage medium on the first plate and the second plate. A plurality of ducts separated by strip-shaped joint portions are formed between the pieces. Thus, the solar collector of the present invention can transfer thermal energy from the solar selective coating to the heat absorbing medium only through the pipe wall of the pipe compared to the technique of welding the previously completed pipe to the plate. Therefore, the proportion of heat energy lost during the transfer process can be reduced, and thus the heat collection efficiency is good. In addition, the manufacturing method of the solar thermal collector of the present invention does not need to precisely position the plate member when welding the plate member, and is welded, compared to the method for manufacturing the welded plate member after the pipe is fabricated on the two plates. The method of forming the plate of the pipe can obtain a relatively flat strip joint, thereby making the outer surface of the plate more flat, and facilitating the formation of the solar selective coating. Accordingly, the solar collector of the present invention and the manufacturing method thereof have high production yield and a relatively simple manufacturing process, and the solar collector has good heat collection efficiency.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Solar collector
102‧‧‧Mold
102a‧‧‧ trench
110, 110a‧‧‧ first board
112‧‧‧ Groove
120‧‧‧Second board
130‧‧‧ Pipes
140‧‧‧Solar selective coating
150‧‧‧track
152‧‧‧ Strip joints
160a, 160b‧‧‧Connected pipe
D‧‧‧ spacing
w‧‧‧Width

1 is a top plan view of a solar heat collector according to an embodiment of the present invention. 2A to 2E are schematic cross-sectional views of the solar thermal collector of Fig. 1 taken along line I-I' during fabrication. 3 is a schematic cross-sectional view of the solar collector of FIG. 2B in another manufacturing process.

100‧‧‧Solar collector

110‧‧‧First board

120‧‧‧Second board

130‧‧‧ Pipes

140‧‧‧Solar selective coating

150‧‧‧track

152‧‧‧ Strip joints

160a, 160b‧‧‧Connected pipe

Claims (15)

A method for manufacturing a solar collector, comprising: providing a first plate and a second plate that are stacked, and welding the first plate and the second plate along a plurality of tracks to make the first a plate member and the second plate member are joined to each other on the tracks to form a plurality of strip-shaped joint portions; and a high-pressure medium is filled between the first plate member and the second plate member to make the plurality of plates The first plate and the second plate outside the strip joint are relatively far apart by pressure and form a plurality of pipes separated by the strip-shaped joint portions; and a solar selective coating is formed (solar) Selective coating) on the outer surface of the first panel. The method of fabricating a solar thermal collector according to claim 1, wherein the method of welding the first plate member and the second plate member comprises laser welding or ultrasonic welding. The method of fabricating a solar thermal collector according to claim 1, wherein the high pressure medium comprises a liquid or a gas. The method for manufacturing the solar collector according to claim 1, further comprising: placing the welded first plate and the second plate into a mold before filling the high-pressure medium, After filling the high pressure medium, the first plate and the second plate are formed by the mold. The method of fabricating a solar thermal collector according to claim 1, wherein the step of forming the solar selective coating on the outer surface of the first plate member is prior to the step of filling the high pressure medium. The method of fabricating a solar thermal collector according to claim 1, wherein the step of forming the solar selective coating on the outer surface of the first plate member is after the step of filling the high pressure medium. The method of manufacturing the solar collector according to the first aspect of the invention, wherein the material of the first plate and the second plate comprises metal or plastic. The method for fabricating a solar thermal collector according to claim 1, wherein the first plate and the second plate that are provided are respectively flat plates. The method for fabricating a solar thermal collector according to claim 1, wherein the one of the first plate member and the second plate member that are provided are semi-formed or formed molding plates. . The method of manufacturing the solar thermal collector according to claim 1, wherein the first plate member is a metal plate member, and the second plate member is a plastic plate member. The method of manufacturing the solar collector according to claim 1, wherein the step of welding the first plate and the second plate along the tracks is applied to an outer surface of the second plate. A solar collector includes: a first plate member; a second plate member overlapping the first plate member, and the first plate member and the second plate member are joined to each other on a plurality of tracks Forming a plurality of strip-shaped joints; a plurality of tubes, the tubes being filled with a high-pressure medium between the first plate member and the second plate member to make the strip-shaped joint portions The first plate member and the second plate member are formed by being relatively far apart by pressure, and the pipes are separated by the strip-shaped joint portions; and a solar selective coating disposed outside the first plate member On the surface. The solar collector of claim 12, wherein the high pressure medium comprises a liquid or a gas. The solar collector according to claim 12, wherein the material of the first plate and the second plate comprises metal or plastic. The solar collector according to claim 12, wherein a surface flatness of the outer surface of the second plate after welding is smaller than a surface flatness of an outer surface of the first plate.